Where do I find a portfolio lender?

[Rob Bianco]

I quit my job and am starting to do real estate full time now but have run into a bit of a snag. All my rentals are residential property and we share the loans for each and we have reached our limit with Fannie Mae & Freddie Mac.

Where does one find a portfolio lender? What kind of rates should I expect? Is this the only way to expand from 10 properties to 100 properties without getting into commercial lending?